Undershirts for tall people

I really wish someone made undershirts that were better suited to tall people. I'm not really THAT tall, but I'm tall enough that it's difficult for me to find the proper sizes alot. Nowhere is this more apparent than when trying to find quality undershirts. Obviously, an undershirt should fit pretty close, because you don't want to be wearing a sail under another shirt, which causes bunching and is really uncomfortable. So, the only way to generally get things long enough for me is to buy XLs, and even that usually doesn't work. I am a size L at best through the chest and the rest of my torso, but Ls tend to be too short. And I feel like even XL focuses more on width than height, so that often leaves it too short AND way too wide. I think this has to be symptomatic of the morbid obesity everywhere. Obviously, everyone in the country is fat so we don't need to make clothes for thin people.

For a while, Polo made some really nice undershirts that were 3 for $15 at TJMaxx, and they were great because they were VERY long. I could buy Mediums and they would be the perfect length, and fit really snug, which I like in an undershirt. But the last pack of those that I bought has departed from that formula, and while I like how they fit through the shoulders/chest/torso, they now barely make my belt line, and thus fail miserably as an undershirt because if I bend in any way, even sitting down, it's like I'm wearing a shirt to show off my (less than inspiring) midriff. I could look for undershirts in tall sizes, but apparel that is offered in tall sizes seems like it tends to be more expensive than regular, and I don't even know if they really make many undershirts in tall sizes. I don't really want to shell out more than a few bucks each for undershirts.

I guess I start trying out some new stuff, as my well-fitting Polos are pretty worn down. I know I am not the only guy with this problem, someone should do something about it.